You can open settings apps programmatically try this(works only from iOS8 onwards).
If you are using Swift:
UIApplication.sharedApplication().openURL(NSURL(string: UIApplicationOpenSettingsURLString))
If you are using Objective-C
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];
For other lower versions(less than iOS8) its not possible to programatically open settings app.